Adding Armour to Rig
I would recommend editing the vertex groups in edit mode for the armor, that way the vertices are all yes and no they way this can be done is by going into edit mode for the armor, removing them all from the groups by pressing control a and then selecting remove for group, and then selecting assign for the groups that correspond to each piece of armor. It might be a bit tedious but it should work. If you don't understand just say so and ill post some screen shots. If you already tried this sorry for wasting your time.